- Prior treatment with other immune-modulating agents within fewer than 4 weeks prior to the first dose of REGN2810, or associated with immune-mediated adverse events that were ≥ grade 1 within 90 days prior to the first dose of REGN2810, or associated with toxicity that resulted in discontinuation of the immune-modulating agent. Examples of immune-modulating agents include therapeutic vaccines, cytokine treatments, or agents that target cytotoxic T-lymphocyte antigen 4 (CTLA-4), 4-1BB (CD137), or OX-40.